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 log10l()                Calculate Long Double Base 10 Logarithm

 #include   <math.h>
 #include   <errno.h>

 long double log10l(x);
 long double x;

    This is the long double precision version of log10(); it calculates
    and returns the long double precision base 10 logarithm of x. See
    log10() for more information.

    Returns:    The base 10 logarithm if successful; -LHUGE_VAL if not.

 Portability:   Not supported by the ANSI standard.